Convection

Convection is the movement of warm particles within fluids. Convection is often found in the air as heated air rises and cool air falls. This is because hot molecules spread apart, making them less dense and causing them to rise. Convection is also found in the ocean as currents of different temperatures travel and interact.

A description of the physics of convection

This video shows that warm water is less dense than cold water

Thermal Radiation or Infra-red Radiation

A description of the experiment the Herschel did to discover infra-red radiation

A video about the properties of thermal radiation or infra-red

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